摘要
目前,采用天然酯油来替代传统的矿物油电力变压器是设计天然酯油变压器的思路之一。但由于天然酯油的高黏度等特点,若将其直接应用于矿物油变压器中很难达到理想的散热效果。采用有限元法对油浸式变压器的温度-流体场特性分布进行仿真设计分析,为提升仿真过程中的收敛性及减少计算量,提出通过设置变压器内外温差的方法即第一类边界条件来模拟变压器内部热量传递过程,以此对比天然酯油和矿物质绝缘油在变压器内温度分布和油流速差异。仿真结果表明,在同一模型及仿真平台下,天然酯油平均流速较矿物油低9.363 mm/s,变压器内部热对流性差,从其温升分布图上可明显观察到矿物油相比天然酯油可更快达到热平衡状态。研究成果能够为天然酯油替换矿物油配电变压器的散热结构设计、天然酯油理化特性的改善等提供依据,具有重要的工程意义。
At present,using natural ester oil to replace the traditional mineral oil power transformer is one of the ideas of designing natural ester oil transformer.However,due to the high viscosity of natural ester oil,it is difficult to achieve ideal heat dissipation effect if it is directly applied to mineral oil transformer.The finite element method was used to simulate the design and analysis of the temperature fluid field characteristic distribution of oil immersed transformer.In order to improve the convergence and reduce the calculation amount in the simulation process,the method of setting the temperature difference between the inside and outside of the transformer,i.e.the first type boundary condition,was proposed to simulate the heat transfer process inside the transformer,so as to compare the temperature distribution and oil flow velocity difference of natural ester oil and mineral insulating oil in the transformer.The simulation results show that under the same model and simulation platform,the average flow rate of natural ester oil is 9.363 mm/s lower than that of mineral oil,and the thermal convection in transformer is poor.From its temperature rise distribution diagram,it can be clearly observed that mineral oil can reach the thermal equilibrium state faster than natural ester oil.The research results can provide basis for the design of heat dissipation structure of natural ester oil replacing mineral oil distribution transformer and the improvement of physical and chemical properties of natural ester oil,which has importan engineering significance.
作者
郭献清
孙文艺
吴红菊
Guo Xianqing;Sun Wenyi;Wu Hongju(Guangdong Mingyang Electric Co.,Ltd.,Zhongshan,Guangdong 528451,China)
出处
《机电工程技术》
2022年第12期209-212,共4页
Mechanical & Electrical Engineering Technology
关键词
天然酯油
变压器
有限元法
温度-流体场
natural ester oil
distribution transformer
finite element method
temperature fluid field
